ASTM A234Gr.WPB CR 21SCH40 SMLS ASME B16.9
ASTM A234 includes wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ASTM B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. etc.
This being said, most of the CS SCH 40 SA 234 Grade WPB Buttweld Pipe Fitting produced have a primary function, i.e. either to change the direction or the rate of the media in any pipeline systems.As we know, ASTM A234 steel pipe fittings are used in pressure piping and in pressure vessel fabrication, for services at moderate and elevated temperatures. The fittings material in this standard consist of killed steel, forgings, bars, plates, seamless or fusion-welded tubular products with filler metal added.The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.